Question about ViewSonic Optiquest Q9b 19" Flat Panel LCD Monitor

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Monitor turns off and is dim

I have duel monitors, my optiquest Q9 started turning off randomly, and when i turn it back on its way dimmer then it used to be.. it keeps getting harder to turn on, and more dim!
when it turns off it still has the green light on like it is still working but a black screen! but my other monitor is working just fine and has perfect everything..
things i have tried:
1 i tried replacing the cords
2 i tried switching the port that its in on my graphics card.
3 hitting really hard lol
4 crying :(
5 and tried messing with the menu settings!
pleas help me out and ty! for even trying!

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  • thaiguy Feb 25, 2009

    I have the same problem. The screen keeps going blank after about a minute. While it works, it is dim and keeps flickering. When it goes out, the green LED where the power button is still stays lit. Turning it off and then on again just does the same thing.

    Could it be the backlight is dying on it?

  • Mayabee Apr 28, 2009

    Whether the tower is on or not the power light on the monitor flashes green and the screen looks as though it has something flashing on it but it is too dull to see. It continues to flash unless I unplug it from its power source.



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  • 103 Answers

Replace pwr inverter board...
replace the video/keyboard as well...

Posted on May 14, 2009


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At start up my Q9 the power light turns green and then starts to blink making a clicking noise. Sometimes it turns on sometimes it doesn't.

If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed OPTIQUEST monitors to get some ideas what to look for:
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.

Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

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From your description, it sounds like the internal 5 Amp cartridge fuse is open. Will need to open the housing and inspect the fuse for failure. If located and failed, replace it and energize the monitor.

If the fuse fails immediately, you have a High Voltage power supply short and the monitor is scrap. It will cost more to replace the power supply/transformer than the monitor is worth.

Hope this provides some useful information.

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read the solution I have wrote on th Q7
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I had this problem with my Q9 and I was glad to find the FixYa website with help. But I will offer more detailed info for novices to make sure you find the capacitors. First of all, it is not easy trying to find out how to open the monitor up! First, set it down flat on it's face, being careful not to scratch the screen. Pop off the cap that covers the stand mount to the screen. You might also want to remove the base by squeezing the bottom tabs to the middle and pushing them out. Once the base cover is removed, you will see the 6 screws holding the base arm to the screen. Remove those and the arm will come off. Now, on the bottom right, there is a beveled slot where you can fit a flat bladded screw driver to start to snap open the case. Move around the case separating it carefully until it is completely un-snapped. Unplug the speaker cable (mine gave me some trouble but I worked it side to side and it finally let go). You can push the videop cable through the the back case to get the case out of the way. Once you have removed the back half of the case you will not immediately see the offending capacitors. You will need to remove 4 phillips screws holding down a metal shield on the power board. You may also have to remove some metal tape covering 2 of the screws. When the screws and tape are removed, you will need to slide the metal shield to the right to release it from a 3 pin connector that the two boards. Be careful that you don't damage that connector. Lift up on it a little and slide it left until the connector is disconnected. Now you can see the capacitors. I only had to replace the 3 bulging ones and that fixed my problem as well. Thanks all for your helpful comments in saving me money on a new monitor!!

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3 Answers

Monitor Randomly Turns Black

I have exactly the same problem with my Benq FP71E+ ..

What i found is a temp fix is this :

When monitor dims and goes black i turn it off , hit the bottom left side (near the BENQ logo) turn it on again and it works ..

This works every time for me . But after a while it switches off again , could be 5 minutes could be 5 hours . Its random

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